UOTe: Kondo-Interacting Topological Antiferromagnet in a Van der Waals Lattice.

Since the initial discovery of 2D van der Waals (vdW) materials, significant effort has been made to incorporate the three properties of magnetism, band structure topology, and strong electron correlations-to leverage emergent quantum phenomena and expand their potential applications. However, the discovery of a single vdW material that intrinsically hosts all three ingredients has remained an outstanding challenge. Here, the discovery of a Kondo-interacting topological antiferromagnet is reported in the vdW 5f electron system UOTe.

Spin stiffness and spin excitation gap of van der Waals ferromagneticFe3+δGeTe2.

Fe3+δGeTe2(FGT) has proved to be an interesting van der Waals (vdW) ferromagnetic compound with a tunable Curie temperature (TC). However, the underlying mechanism for varyingTCremains elusive. Here, we systematically investigate and compare low-temperature magnetic properties of single crystalline FGT samples that exhibitTCs ranging from 160 K to 205 K.

A single crystal study of Kagome metals UMnGe and UFeGe.

Single crystals of UMnGe and UFeGe with a Kagome lattice structure were synthesized using a high-temperature self-flux crystal growth method. The physical properties of these crystals were characterized through measurements of resistivity, magnetism, and specific heat. UFeGe exhibits ferromagnetic ground state and anomalous Hall effect, and UMnGe demonstrates a complex magnetic structure.

Evidence of Temperature-Dependent Interplay between Spin and Orbital Moment in van der Waals Ferromagnet VI.

van der Waals materials provide a versatile toolbox for the emergence of new quantum phenomena and fabrication of functional heterostructures. Among them, the trihalide VI stands out for its unique magnetic and structural landscape. Here we investigate the spin and orbital magnetic degrees of freedom in the layered ferromagnet VI by means of temperature-dependent X-ray absorption spectroscopy and X-ray magnetic circular and linear dichroism.

Observation of Termination-Dependent Topological Connectivity in a Magnetic Weyl Kagome Lattice.

Engineering surfaces and interfaces of materials promises great potential in the field of heterostructures and quantum matter designers, with the opportunity to drive new many-body phases that are absent in the bulk compounds. Here, we focus on the magnetic Weyl kagome system CoSnS and show how for the terminations of different samples the Weyl points connect differently, still preserving the bulk-boundary correspondence. Scanning tunneling microscopy has suggested such a scenario indirectly, and here, we probe the Fermiology of CoSnS directly, by linking it to its real space surface distribution.

Field-induced partial disorder in a Shastry-Sutherland lattice.

A 2-Q antiferromagnetic order of the ferromagnetic dimers was found below T = 2.9 K in the Shastry-Sutherland lattice BaNdZnS by single crystal neutron diffraction. The magnetic order can be understood by the orthogonal arrangement of local Ising Nd spins, identified by polarized neutrons.

Breakdown of the scaling relation of anomalous Hall effect in Kondo lattice ferromagnet USbTe.

The interaction between strong correlation and Berry curvature is an open territory of in the field of quantum materials. Here we report large anomalous Hall conductivity in a Kondo lattice ferromagnet USbTe which is dominated by intrinsic Berry curvature at low temperatures. However, the Berry curvature induced anomalous Hall effect does not follow the scaling relation derived from Fermi liquid theory.

Synthesis, chiral crystal structure, and magnetic properties of BaGaOCl.

A new compound, BaGaOCl, isostructural with BaFeOCl, was synthesized by solid-state reaction in air. Through single-crystal and powder X-ray diffraction analysis, the crystal structure was determined to be cubic with chiral space group I23 and unit-cell parameter a = 9.928 (1) Å.

Spin Reorientation in Antiferromagnetic MnPdSe with an Anti-CeCoIn Structure Type.

MnPdSe, a derivative of the anti-CeCoIn-type phase, was synthesized from a high-temperature solid-state reaction, structurally determined by X-ray diffraction, and magnetically characterized with a combined magnetic measurement and neutron powder diffraction (NPD). According to the X-ray diffraction results, MnPdSe crystallizes in a layered tetragonal structure with the same space group as CeCoIn, 4/ (No. 123).

Spin stiffness of chromium-based van der Waals ferromagnets.

Low temperature magnetization of CrI, CrSiTeand CrGeTesingle crystals were systematically studied. Based on the temperature dependence of extrapolated spontaneous magnetization from magnetic isotherms measured at different temperatures, the spin stiffness constant () and spin excitation gap (Δ) were extracted according to Bloch's law. For spin stiffness,is estimated to be 27 ± 6 meV Å, 20 ± 3 meV Åand 38 ± 7 meV Åfor CrI, CrSiTeand CrGeTerespectively.

LiRuOCl·10HO: crystal structure, magnetic properties and bonding interactions in ruthenium-oxo complexes.

The results of the structural determination, magnetic characterization, and theoretical calculations of a new ruthenium-oxo complex, Li[RuOCl]·10HO, are presented. Single crystals were grown using solvent methods and the crystal structure was characterized by single crystal X-ray diffraction. Li[RuOCl]·10HO crystallizes into a low-symmetry triclinic structure (P1) due to the much smaller Li cation compared to K cation in the tetragonal complex K[RuOCl]·HO.

VI -a New Layered Ferromagnetic Semiconductor.

2D materials are promising candidates for next-generation electronic devices. In this regime, insulating 2D ferromagnets, which remain rare, are of special importance due to their potential for enabling new device architectures. Here the discovery of ferromagnetism is reported in a layered van der Waals semiconductor, VI , which is based on honeycomb vanadium layers separated by an iodine-iodine van der Waals gap.

Realization of a Type-II Nodal-Line Semimetal in MgBi.

Nodal-line semimetals (NLSs) represent a new type of topological semimetallic phase beyond Weyl and Dirac semimetals in the sense that they host closed loops or open curves of band degeneracies in the Brillouin zone. Parallel to the classification of type-I and type-II Weyl semimetals, there are two types of NLSs. The type-I NLS phase has been proposed and realized in many compounds, whereas the exotic type-II NLS phase that strongly violates Lorentz symmetry has remained elusive.

Triangular Rare-Earth Lattice Materials RbBa R(BO) ( R = Y, Gd-Yb) and Comparison to the KBa R(BO) Analogs.

A previously unreported family of electrically insulating rare-earth borates, RbBa R(BO) ( R = Y, Gd-Yb), was designed and then successfully obtained by traditional solid-state reaction. They crystallize in a monoclinic crystal system space group P2 /m (No. 11).

Degeneracy of the 1/8 Plateau and Antiferromagnetic Phases in the Shastry-Sutherland Magnet TmB_{4}.

The 1/8 fractional plateau phase (1/8 FPP) in Shastry-Sutherland lattice (SSL) spin systems has been viewed an exemplar of emergence on an Archimedean lattice. Here we explore this phase in the Ising magnet TmB_{4} using high-resolution specific heat (C) and magnetization (M) in the field-temperature plane. We show that the 1/8 FPP is smoothly connected to the antiferromagnetic phase on ramping the field from H=0.

REMoO and REMoO, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures ( RE = La-Pr).

The previously unreported REMoO and REMoO phases were synthesized in vacuo from rare-earth oxides, molybdenum oxide, and molybdenum metal using halide fluxes at 875-1000 °C. Both phases adopt structures in the triclinic P1̅ space group albeit with several notable differences. The structures display an ordering of layers along the a direction of the unit cell, forming distinct honeycomb-related lattice arrangements composed of MoO octahedra and vacancies.

Magnetic and electronic properties of the Cu-substituted Weyl semimetal candidate ZrCoSn.

We report that the partial substitution of Cu for Co has a significant impact on the magnetic properties of the Heusler-phase Weyl fermion candidate ZrCoSn. Polycrystalline samples of ZrCo Cu Sn (x  =  0.0-1.

Monoclinic 122-Type BaIr₂Ge₂ with a Channel Framework: A Structural Connection between Clathrate and Layered Compounds.

A new 122-type phase, monoclinic BaIr₂Ge₂ is successfully synthesized by arc melting; X-ray diffraction and scanning electron microscopy are used to purify the phase and determine its crystal structure. BaIr₂Ge₂ adopts a clathrate-like channel framework structure of the monoclinic BaRh₂Si₂-type, with space group 2₁/. Structural comparisons of clathrate, ThCr₂Si₂, CaBe₂Ge₂, and BaRh₂Si structure types indicate that BaIr₂Ge₂ can be considered as an intermediate between clathrate and layered compounds.

Enhancement of the Superconducting Gap by Nesting in CaKFe_{4}As_{4}: A New High Temperature Superconductor.

We use high resolution angle resolved photoemission spectroscopy and density functional theory with measured crystal structure parameters to study the electronic properties of CaKFe_{4}As_{4}. In contrast to the related CaFe_{2}As_{2} compounds, CaKFe_{4}As_{4} has a high T_{c} of 35 K at stochiometric composition. This presents a unique opportunity to study the properties of high temperature superconductivity in the iron arsenides in the absence of doping or substitution.

Chemical Bath Deposition of p-Type Transparent, Highly Conducting (CuS)x:(ZnS)1-x Nanocomposite Thin Films and Fabrication of Si Heterojunction Solar Cells.

P-type transparent conducting films of nanocrystalline (CuS)x:(ZnS)1-x were synthesized by facile and low-cost chemical bath deposition. Wide angle X-ray scattering (WAXS) and high resolution transmission electron microscopy (HRTEM) were used to evaluate the nanocomposite structure, which consists of sub-5 nm crystallites of sphalerite ZnS and covellite CuS. Film transparency can be controlled by tuning the size of the nanocrystallites, which is achieved by adjusting the concentration of the complexing agent during growth; optimal films have optical transmission above 70% in the visible range of the spectrum.

Antimony Doping in Solution-processed Cu2 ZnSn(S,Se)4 Solar Cells.

Kesterite Cu2 ZnSn(S,Se)4 (CZTSSe) is obtained using a facile precursor-solution method followed by selenization. Power-conversion efficiency of 6.0 % is achieved and further improved to 8.

Study of ⁵⁷Fe Mössbauer effect in RFe₂Zn₂₀ (R = Lu, Yb, Gd).

We report measurements of (57)Fe Mössbauer spectra for RFe2Zn20 (R = Lu, Yb, Gd) from  ∼4.5 K to room temperature. The obtained isomer shift values are very similar for all three compounds, their temperature dependence was analyzed within the Debye model and resulted in an estimate of the Debye temperatures of 450-500 K.

A family of binary magnetic icosahedral quasicrystals based on rare earths and cadmium.

Examples of stable binary icosahedral quasicrystals are relatively rare, and at present there are no known examples featuring localized magnetic moments. These would represent an ideal model system for attaining a deeper understanding of the nature of magnetic interactions in aperiodic lattices. Here we report the discovery of a family of at least seven rare earth icosahedral binary quasicrystals, i-R-Cd (R  =  Gd to Tm, Y), six of which bear localized magnetic moments.